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ASME B18.6.3 Recess Close Tolerance 100-deg Flat Countersuk Head Screws (Machine Screws Only)
Nominal Size or Basic Screw Diameter |
Type I |
Type IA |
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Recess Dia., M,Ref. |
Driver Size |
Recess Penetration Gaging Depth, P |
Recess Dia., M,Ref. |
Driver Size |
Recess Penetration Gaging Depth, P |
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Max. |
Min. |
Max. |
Min. |
||||||
4 |
0.1120 |
0.110 |
1 |
0.071 |
0.055 |
0.110 |
1 |
0.068 |
0.052 |
6 |
0.1380 |
0.148 |
2 |
0.075 |
0.052 |
0.148 |
2 |
0.071 |
0.053 |
8 |
0.1640 |
0.162 |
2 |
0.090 |
0.067 |
0.162 |
2 |
0.086 |
0.068 |
10 |
0.1900 |
0.178 |
2 |
0.105 |
0.082 |
0.178 |
2 |
0.101 |
0.083 |
1/4 |
0.2500 |
0.240 |
3 |
0.118 |
0.095 |
0.240 |
3 |
0.114 |
0.096 |
5/16 |
0.3125 |
0.310 |
4 |
0.148 |
0.126 |
0.310 |
4 |
0.145 |
0.127 |
3/8 |
0.3750 |
0.336 |
4 |
0.173 |
0.151 |
0.336 |
4 |
0.170 |
0.152 |
7/16 |
0.4375 |
0.360 |
4 |
0.198 |
0.176 |
0.360 |
4 |
0.194 |
0.176 |
1/2 |
0.5000 |
0.386 |
4 |
0.226 |
0.204 |
0.386 |
4 |
0.222 |
0.204 |
9/16 |
0.5625 |
0.418 |
4 |
0.256 |
0.234 |
0.418 |
4 |
0.253 |
0.235 |
5/8 |
0.6250 |
0.504 |
5 |
0.248 |
0.222 |
0.488 |
5 |
0.228 |
0.207 |
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